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Tk_GetScrollInfo(3)                         Tk Library Procedures                        Tk_GetScrollInfo(3)



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NAME
       Tk_GetScrollInfo, Tk_GetScrollInfoObj - parse arguments for scrolling commands

SYNOPSIS
       #include <tk.h>

       int
       Tk_GetScrollInfo(interp, argc, argv, dblPtr, intPtr)

       int
       Tk_GetScrollInfoObj(interp, objc, objv, dblPtr, intPtr)

ARGUMENTS
       Tcl_Interp *interp (in)          Interpreter to use for error reporting.

       int argc (in)                    Number of strings in argv array.

       const char *argv[] (in)          Argument  strings.   These  represent  the entire widget command, of
                                        which the first word is typically the widget  name  and  the  second
                                        word is typically xview or yview.

       int objc (in)                    Number of Tcl_Obj's in objv array.

       Tcl_Obj *const objv[] (in)       Argument  objects.   These  represent  the entire widget command, of
                                        which the first word is typically the widget  name  and  the  second
                                        word is typically xview or yview.

       double *dblPtr (out)             Filled in with fraction from moveto option, if any.

       int *intPtr (out)                Filled  in  with line or page count from scroll option, if any.  The
                                        value may be negative.
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DESCRIPTION
       Tk_GetScrollInfo parses the arguments expected by widget scrolling commands such as xview and  yview.
       It receives the entire list of words that make up a widget command and parses the words starting with
       argv[2].  The words starting with argv[2] must have one of the following forms:
              moveto fraction
              scroll number units
              scroll number pages

       Any of the moveto, scroll, units, and pages keywords may be abbreviated.   If  argv  has  the  moveto
       form,  TK_SCROLL_MOVETO  is returned as result and *dblPtr is filled in with the fraction argument to
       the command, which must be a proper real value.  If argv has  the  scroll  form,  TK_SCROLL_UNITS  or
       TK_SCROLL_PAGES  is  returned  and *intPtr is filled in with the number value, which must be a proper
       integer.  If an error occurs in parsing the arguments, TK_SCROLL_ERROR is returned and an error  mes-sage message
       sage is left in interp->result.

       Tk_GetScrollInfoObj  is  identical  in  function  to  Tk_GetScrollInfo.  However, Tk_GetScrollInfoObj
       accepts Tcl_Obj style arguments, making it more appropriate for use with new development.


KEYWORDS
       parse, scrollbar, scrolling command, xview, yview



Tk                                                   8.0                                 Tk_GetScrollInfo(3)